cell structure - goharmokamelco.com · cell structure . a view of the cell. cellular organization...
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Cell structure
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A View of the Cell
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Cellular Organization
• Cell
• Tissue – group of cells functioning
together.
• Organ – group of tissues functioning
together.
• Organ System – group of organs
functioning together.
• Organism – group of organ systems
functioning together.
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The History of the Cell
• The Cell
–The basic unit of an organism
–Discovery made possible by the
invention of the microscope
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Cell Theory
• All organisms are made up of one or
more cells.
• The cell is the basic unit of
organization of all organisms.
• All cells come from other cells all
ready in existence.
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Two Basic Cell Types
1) Prokaryote
–Lacks internal compartments.
–No true nucleus.
–Most are single-celled (unicellular)
organisms.
–Examples: bacteria
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Two Basic Cell Types
2) Eukaryote
–Has several internal structures (organelles).
–True nucleus.
–Either unicellular or multicellular.
unicellular example: yeast
multicellular examples:
plants and animals
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The Parts of The Eukaryotic Cell
1) Boundaries
A) Plasma Membrane
-- Serves as a boundary
between the cell and its
external environment.
-- Allows materials to pass in
and out of the cell.
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The Parts of The Eukaryotic Cell
1-Boundaries
B) Cell Wall
-- Surrounds the plasma
membrane of the cells of
plants, bacteria, and fungi.
-- Plant cell walls contain
cellulose while fungi cell
walls contain chitin.
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The Parts of The Eukaryotic Cell
2) Controls
A) Nucleus
• Regulates cell function.
• Surrounded by a double-layered
membrane (nuclear enveloped) with
large pores that allow materials to
pass in and out of the nucleus.
• Contains chromatin – long tangles of
DNA.
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The Parts of The Eukaryotic Cell
2) Controls
B) Nucleolus
•Found in the nucleus and
responsible for ribosome
production. Ribosomes are
the sites of protein
production.
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The Parts of The Eukaryotic Cell
3-Assembly
–Cytoplasm
•The jelly-like material that
surrounds the organelles.
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The Parts of The Eukaryotic Cell
4) Transport
A) Endoplasmic reticulum
•Folded membrane that acts as the
cell’s delivery system.
•Smooth E.R. contains enzymes for
lipid synthesis.
•Rough E.R. is studded with
ribosomes for protein synthesis.
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The Parts of The Eukaryotic Cell
4) Transport
B) Golgi apparatus (or Golgi body)
•A series of flattened sacs where
newly made lipids and proteins from
the E.R. are repackaged and shipped
to the plasma membrane.
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The Parts of The Eukaryotic Cell
5) Storage
A) Vacuoles
•A sac of fluid surrounded by a
membrane used to store food,
fluid, or waste products.
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The Parts of The Eukaryotic Cell
5) Storage
B) Lysosomes
•Contain a digestive enzyme.
•Can fuse with vacuoles to digest
food, or can digest worn cell parts.
•Also known as “suicide sacs”
because they can also destroy the
whole cell.
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The Parts of The Eukaryotic Cell
6) Energy Transformers
Mitochondria • Produce the energy for the cell.
• Also known as the “powerhouse of the cell”.
• Has a highly folded inner membrane (cristae).
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The Parts of The Eukaryotic Cell
6) Energy Transformers
B) Chloroplasts
-- Found in plant cells and some protists.
-- Transforms light energy into chemical energy which is stored in food molecules.
-- Contain chlorophyll – a green pigment that traps light energy and gives plants their green color.
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The Parts of The Eukaryotic Cell
7) Support
–Cytoskeleton
•A network of thin, fibrous materials that act as a scaffold and support the organelles.
•Microtubules – hollow filaments of protein.
•Microfilaments – solid filaments of protein.
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The Parts of The Eukaryotic Cell
8) Locomotion
1) Cilia
•Short, numerous, hair-like projections
from the plasma membrane.
•Move with a coordinated beating
action.
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The Parts of The Eukaryotic Cell
8) Locomotion
B) Flagella
•Longer, less numerous projections
from the plasma membrane.
•Move with a whiplike action.
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The Parts of The Eukaryotic Cell
9) Cell Division
Centrioles
– made of protein.
– play a role in the splitting of the cell into two
cells.
– found in animal and fungi cells.
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Composite Animal Cell
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Composite Animal Cell
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Thanks for
attention